1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * XDR support for nfsd 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 */ 7 8 #include "vfs.h" 9 #include "xdr.h" 10 #include "auth.h" 11 12 /* 13 * Mapping of S_IF* types to NFS file types 14 */ 15 static const u32 nfs_ftypes[] = { 16 NFNON, NFCHR, NFCHR, NFBAD, 17 NFDIR, NFBAD, NFBLK, NFBAD, 18 NFREG, NFBAD, NFLNK, NFBAD, 19 NFSOCK, NFBAD, NFLNK, NFBAD, 20 }; 21 22 23 /* 24 * Basic NFSv2 data types (RFC 1094 Section 2.3) 25 */ 26 27 /** 28 * svcxdr_encode_stat - Encode an NFSv2 status code 29 * @xdr: XDR stream 30 * @status: status value to encode 31 * 32 * Return values: 33 * %false: Send buffer space was exhausted 34 * %true: Success 35 */ 36 bool 37 svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status) 38 { 39 __be32 *p; 40 41 p = xdr_reserve_space(xdr, sizeof(status)); 42 if (!p) 43 return false; 44 *p = status; 45 46 return true; 47 } 48 49 /** 50 * svcxdr_decode_fhandle - Decode an NFSv2 file handle 51 * @xdr: XDR stream positioned at an encoded NFSv2 FH 52 * @fhp: OUT: filled-in server file handle 53 * 54 * Return values: 55 * %false: The encoded file handle was not valid 56 * %true: @fhp has been initialized 57 */ 58 bool 59 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp) 60 { 61 __be32 *p; 62 63 p = xdr_inline_decode(xdr, NFS_FHSIZE); 64 if (!p) 65 return false; 66 fh_init(fhp, NFS_FHSIZE); 67 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); 68 fhp->fh_handle.fh_size = NFS_FHSIZE; 69 70 return true; 71 } 72 73 static bool 74 svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp) 75 { 76 __be32 *p; 77 78 p = xdr_reserve_space(xdr, NFS_FHSIZE); 79 if (!p) 80 return false; 81 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); 82 83 return true; 84 } 85 86 static __be32 * 87 encode_timeval(__be32 *p, const struct timespec64 *time) 88 { 89 *p++ = cpu_to_be32((u32)time->tv_sec); 90 if (time->tv_nsec) 91 *p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC); 92 else 93 *p++ = xdr_zero; 94 return p; 95 } 96 97 static bool 98 svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len) 99 { 100 u32 size, i; 101 __be32 *p; 102 char *c; 103 104 if (xdr_stream_decode_u32(xdr, &size) < 0) 105 return false; 106 if (size == 0 || size > NFS_MAXNAMLEN) 107 return false; 108 p = xdr_inline_decode(xdr, size); 109 if (!p) 110 return false; 111 112 *len = size; 113 *name = (char *)p; 114 for (i = 0, c = *name; i < size; i++, c++) 115 if (*c == '\0' || *c == '/') 116 return false; 117 118 return true; 119 } 120 121 static bool 122 svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp, 123 char **name, unsigned int *len) 124 { 125 return svcxdr_decode_fhandle(xdr, fhp) && 126 svcxdr_decode_filename(xdr, name, len); 127 } 128 129 static bool 130 svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr, 131 struct iattr *iap) 132 { 133 u32 tmp1, tmp2; 134 __be32 *p; 135 136 p = xdr_inline_decode(xdr, XDR_UNIT * 8); 137 if (!p) 138 return false; 139 140 iap->ia_valid = 0; 141 142 /* 143 * Some Sun clients put 0xffff in the mode field when they 144 * mean 0xffffffff. 145 */ 146 tmp1 = be32_to_cpup(p++); 147 if (tmp1 != (u32)-1 && tmp1 != 0xffff) { 148 iap->ia_valid |= ATTR_MODE; 149 iap->ia_mode = tmp1; 150 } 151 152 tmp1 = be32_to_cpup(p++); 153 if (tmp1 != (u32)-1) { 154 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1); 155 if (uid_valid(iap->ia_uid)) 156 iap->ia_valid |= ATTR_UID; 157 } 158 159 tmp1 = be32_to_cpup(p++); 160 if (tmp1 != (u32)-1) { 161 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1); 162 if (gid_valid(iap->ia_gid)) 163 iap->ia_valid |= ATTR_GID; 164 } 165 166 tmp1 = be32_to_cpup(p++); 167 if (tmp1 != (u32)-1) { 168 iap->ia_valid |= ATTR_SIZE; 169 iap->ia_size = tmp1; 170 } 171 172 tmp1 = be32_to_cpup(p++); 173 tmp2 = be32_to_cpup(p++); 174 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { 175 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; 176 iap->ia_atime.tv_sec = tmp1; 177 iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC; 178 } 179 180 tmp1 = be32_to_cpup(p++); 181 tmp2 = be32_to_cpup(p++); 182 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { 183 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; 184 iap->ia_mtime.tv_sec = tmp1; 185 iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC; 186 /* 187 * Passing the invalid value useconds=1000000 for mtime 188 * is a Sun convention for "set both mtime and atime to 189 * current server time". It's needed to make permissions 190 * checks for the "touch" program across v2 mounts to 191 * Solaris and Irix boxes work correctly. See description of 192 * sattr in section 6.1 of "NFS Illustrated" by 193 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 194 */ 195 if (tmp2 == 1000000) 196 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); 197 } 198 199 return true; 200 } 201 202 /** 203 * svcxdr_encode_fattr - Encode NFSv2 file attributes 204 * @rqstp: Context of a completed RPC transaction 205 * @xdr: XDR stream 206 * @fhp: File handle to encode 207 * @stat: Attributes to encode 208 * 209 * Return values: 210 * %false: Send buffer space was exhausted 211 * %true: Success 212 */ 213 bool 214 svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr, 215 const struct svc_fh *fhp, const struct kstat *stat) 216 { 217 struct user_namespace *userns = nfsd_user_namespace(rqstp); 218 struct dentry *dentry = fhp->fh_dentry; 219 int type = stat->mode & S_IFMT; 220 struct timespec64 time; 221 __be32 *p; 222 u32 fsid; 223 224 p = xdr_reserve_space(xdr, XDR_UNIT * 17); 225 if (!p) 226 return false; 227 228 *p++ = cpu_to_be32(nfs_ftypes[type >> 12]); 229 *p++ = cpu_to_be32((u32)stat->mode); 230 *p++ = cpu_to_be32((u32)stat->nlink); 231 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid)); 232 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid)); 233 234 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) 235 *p++ = cpu_to_be32(NFS_MAXPATHLEN); 236 else 237 *p++ = cpu_to_be32((u32) stat->size); 238 *p++ = cpu_to_be32((u32) stat->blksize); 239 if (S_ISCHR(type) || S_ISBLK(type)) 240 *p++ = cpu_to_be32(new_encode_dev(stat->rdev)); 241 else 242 *p++ = cpu_to_be32(0xffffffff); 243 *p++ = cpu_to_be32((u32)stat->blocks); 244 245 switch (fsid_source(fhp)) { 246 case FSIDSOURCE_FSID: 247 fsid = (u32)fhp->fh_export->ex_fsid; 248 break; 249 case FSIDSOURCE_UUID: 250 fsid = ((u32 *)fhp->fh_export->ex_uuid)[0]; 251 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1]; 252 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2]; 253 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3]; 254 break; 255 default: 256 fsid = new_encode_dev(stat->dev); 257 break; 258 } 259 *p++ = cpu_to_be32(fsid); 260 261 *p++ = cpu_to_be32((u32)stat->ino); 262 p = encode_timeval(p, &stat->atime); 263 time = stat->mtime; 264 lease_get_mtime(d_inode(dentry), &time); 265 p = encode_timeval(p, &time); 266 encode_timeval(p, &stat->ctime); 267 268 return true; 269 } 270 271 /* 272 * XDR decode functions 273 */ 274 275 int 276 nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) 277 { 278 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 279 struct nfsd_fhandle *args = rqstp->rq_argp; 280 281 return svcxdr_decode_fhandle(xdr, &args->fh); 282 } 283 284 int 285 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p) 286 { 287 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 288 struct nfsd_sattrargs *args = rqstp->rq_argp; 289 290 return svcxdr_decode_fhandle(xdr, &args->fh) && 291 svcxdr_decode_sattr(rqstp, xdr, &args->attrs); 292 } 293 294 int 295 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p) 296 { 297 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 298 struct nfsd_diropargs *args = rqstp->rq_argp; 299 300 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len); 301 } 302 303 int 304 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p) 305 { 306 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 307 struct nfsd_readargs *args = rqstp->rq_argp; 308 u32 totalcount; 309 310 if (!svcxdr_decode_fhandle(xdr, &args->fh)) 311 return 0; 312 if (xdr_stream_decode_u32(xdr, &args->offset) < 0) 313 return 0; 314 if (xdr_stream_decode_u32(xdr, &args->count) < 0) 315 return 0; 316 /* totalcount is ignored */ 317 if (xdr_stream_decode_u32(xdr, &totalcount) < 0) 318 return 0; 319 320 return 1; 321 } 322 323 int 324 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p) 325 { 326 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 327 struct nfsd_writeargs *args = rqstp->rq_argp; 328 struct kvec *head = rqstp->rq_arg.head; 329 struct kvec *tail = rqstp->rq_arg.tail; 330 u32 beginoffset, totalcount; 331 size_t remaining; 332 333 if (!svcxdr_decode_fhandle(xdr, &args->fh)) 334 return 0; 335 /* beginoffset is ignored */ 336 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0) 337 return 0; 338 if (xdr_stream_decode_u32(xdr, &args->offset) < 0) 339 return 0; 340 /* totalcount is ignored */ 341 if (xdr_stream_decode_u32(xdr, &totalcount) < 0) 342 return 0; 343 344 /* opaque data */ 345 if (xdr_stream_decode_u32(xdr, &args->len) < 0) 346 return 0; 347 if (args->len > NFSSVC_MAXBLKSIZE_V2) 348 return 0; 349 remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len; 350 remaining -= xdr_stream_pos(xdr); 351 if (remaining < xdr_align_size(args->len)) 352 return 0; 353 args->first.iov_base = xdr->p; 354 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); 355 356 return 1; 357 } 358 359 int 360 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p) 361 { 362 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 363 struct nfsd_createargs *args = rqstp->rq_argp; 364 365 return svcxdr_decode_diropargs(xdr, &args->fh, 366 &args->name, &args->len) && 367 svcxdr_decode_sattr(rqstp, xdr, &args->attrs); 368 } 369 370 int 371 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p) 372 { 373 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 374 struct nfsd_renameargs *args = rqstp->rq_argp; 375 376 return svcxdr_decode_diropargs(xdr, &args->ffh, 377 &args->fname, &args->flen) && 378 svcxdr_decode_diropargs(xdr, &args->tfh, 379 &args->tname, &args->tlen); 380 } 381 382 int 383 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p) 384 { 385 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 386 struct nfsd_linkargs *args = rqstp->rq_argp; 387 388 return svcxdr_decode_fhandle(xdr, &args->ffh) && 389 svcxdr_decode_diropargs(xdr, &args->tfh, 390 &args->tname, &args->tlen); 391 } 392 393 int 394 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p) 395 { 396 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 397 struct nfsd_symlinkargs *args = rqstp->rq_argp; 398 struct kvec *head = rqstp->rq_arg.head; 399 400 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen)) 401 return 0; 402 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0) 403 return 0; 404 if (args->tlen == 0) 405 return 0; 406 407 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); 408 args->first.iov_base = xdr_inline_decode(xdr, args->tlen); 409 if (!args->first.iov_base) 410 return 0; 411 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs); 412 } 413 414 int 415 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p) 416 { 417 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 418 struct nfsd_readdirargs *args = rqstp->rq_argp; 419 420 if (!svcxdr_decode_fhandle(xdr, &args->fh)) 421 return 0; 422 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0) 423 return 0; 424 if (xdr_stream_decode_u32(xdr, &args->count) < 0) 425 return 0; 426 427 return 1; 428 } 429 430 /* 431 * XDR encode functions 432 */ 433 434 int 435 nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p) 436 { 437 struct xdr_stream *xdr = &rqstp->rq_res_stream; 438 struct nfsd_stat *resp = rqstp->rq_resp; 439 440 return svcxdr_encode_stat(xdr, resp->status); 441 } 442 443 int 444 nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) 445 { 446 struct xdr_stream *xdr = &rqstp->rq_res_stream; 447 struct nfsd_attrstat *resp = rqstp->rq_resp; 448 449 if (!svcxdr_encode_stat(xdr, resp->status)) 450 return 0; 451 switch (resp->status) { 452 case nfs_ok: 453 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) 454 return 0; 455 break; 456 } 457 458 return 1; 459 } 460 461 int 462 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p) 463 { 464 struct xdr_stream *xdr = &rqstp->rq_res_stream; 465 struct nfsd_diropres *resp = rqstp->rq_resp; 466 467 if (!svcxdr_encode_stat(xdr, resp->status)) 468 return 0; 469 switch (resp->status) { 470 case nfs_ok: 471 if (!svcxdr_encode_fhandle(xdr, &resp->fh)) 472 return 0; 473 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) 474 return 0; 475 break; 476 } 477 478 return 1; 479 } 480 481 int 482 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p) 483 { 484 struct xdr_stream *xdr = &rqstp->rq_res_stream; 485 struct nfsd_readlinkres *resp = rqstp->rq_resp; 486 struct kvec *head = rqstp->rq_res.head; 487 488 if (!svcxdr_encode_stat(xdr, resp->status)) 489 return 0; 490 switch (resp->status) { 491 case nfs_ok: 492 if (xdr_stream_encode_u32(xdr, resp->len) < 0) 493 return 0; 494 xdr_write_pages(xdr, &resp->page, 0, resp->len); 495 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0) 496 return 0; 497 break; 498 } 499 500 return 1; 501 } 502 503 int 504 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p) 505 { 506 struct xdr_stream *xdr = &rqstp->rq_res_stream; 507 struct nfsd_readres *resp = rqstp->rq_resp; 508 struct kvec *head = rqstp->rq_res.head; 509 510 if (!svcxdr_encode_stat(xdr, resp->status)) 511 return 0; 512 switch (resp->status) { 513 case nfs_ok: 514 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) 515 return 0; 516 if (xdr_stream_encode_u32(xdr, resp->count) < 0) 517 return 0; 518 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base, 519 resp->count); 520 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0) 521 return 0; 522 break; 523 } 524 525 return 1; 526 } 527 528 int 529 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p) 530 { 531 struct xdr_stream *xdr = &rqstp->rq_res_stream; 532 struct nfsd_readdirres *resp = rqstp->rq_resp; 533 struct xdr_buf *dirlist = &resp->dirlist; 534 535 if (!svcxdr_encode_stat(xdr, resp->status)) 536 return 0; 537 switch (resp->status) { 538 case nfs_ok: 539 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len); 540 /* no more entries */ 541 if (xdr_stream_encode_item_absent(xdr) < 0) 542 return 0; 543 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0) 544 return 0; 545 break; 546 } 547 548 return 1; 549 } 550 551 int 552 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p) 553 { 554 struct xdr_stream *xdr = &rqstp->rq_res_stream; 555 struct nfsd_statfsres *resp = rqstp->rq_resp; 556 struct kstatfs *stat = &resp->stats; 557 558 if (!svcxdr_encode_stat(xdr, resp->status)) 559 return 0; 560 switch (resp->status) { 561 case nfs_ok: 562 p = xdr_reserve_space(xdr, XDR_UNIT * 5); 563 if (!p) 564 return 0; 565 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2); 566 *p++ = cpu_to_be32(stat->f_bsize); 567 *p++ = cpu_to_be32(stat->f_blocks); 568 *p++ = cpu_to_be32(stat->f_bfree); 569 *p = cpu_to_be32(stat->f_bavail); 570 break; 571 } 572 573 return 1; 574 } 575 576 /** 577 * nfssvc_encode_nfscookie - Encode a directory offset cookie 578 * @resp: readdir result context 579 * @offset: offset cookie to encode 580 * 581 * The buffer space for the offset cookie has already been reserved 582 * by svcxdr_encode_entry_common(). 583 */ 584 void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset) 585 { 586 __be32 cookie = cpu_to_be32(offset); 587 588 if (!resp->cookie_offset) 589 return; 590 591 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie, 592 sizeof(cookie)); 593 resp->cookie_offset = 0; 594 } 595 596 static bool 597 svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name, 598 int namlen, loff_t offset, u64 ino) 599 { 600 struct xdr_buf *dirlist = &resp->dirlist; 601 struct xdr_stream *xdr = &resp->xdr; 602 603 if (xdr_stream_encode_item_present(xdr) < 0) 604 return false; 605 /* fileid */ 606 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0) 607 return false; 608 /* name */ 609 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0) 610 return false; 611 /* cookie */ 612 resp->cookie_offset = dirlist->len; 613 if (xdr_stream_encode_u32(xdr, ~0U) < 0) 614 return false; 615 616 return true; 617 } 618 619 /** 620 * nfssvc_encode_entry - encode one NFSv2 READDIR entry 621 * @data: directory context 622 * @name: name of the object to be encoded 623 * @namlen: length of that name, in bytes 624 * @offset: the offset of the previous entry 625 * @ino: the fileid of this entry 626 * @d_type: unused 627 * 628 * Return values: 629 * %0: Entry was successfully encoded. 630 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err 631 * 632 * On exit, the following fields are updated: 633 * - resp->xdr 634 * - resp->common.err 635 * - resp->cookie_offset 636 */ 637 int nfssvc_encode_entry(void *data, const char *name, int namlen, 638 loff_t offset, u64 ino, unsigned int d_type) 639 { 640 struct readdir_cd *ccd = data; 641 struct nfsd_readdirres *resp = container_of(ccd, 642 struct nfsd_readdirres, 643 common); 644 unsigned int starting_length = resp->dirlist.len; 645 646 /* The offset cookie for the previous entry */ 647 nfssvc_encode_nfscookie(resp, offset); 648 649 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino)) 650 goto out_toosmall; 651 652 xdr_commit_encode(&resp->xdr); 653 resp->common.err = nfs_ok; 654 return 0; 655 656 out_toosmall: 657 resp->cookie_offset = 0; 658 resp->common.err = nfserr_toosmall; 659 resp->dirlist.len = starting_length; 660 return -EINVAL; 661 } 662 663 /* 664 * XDR release functions 665 */ 666 void nfssvc_release_attrstat(struct svc_rqst *rqstp) 667 { 668 struct nfsd_attrstat *resp = rqstp->rq_resp; 669 670 fh_put(&resp->fh); 671 } 672 673 void nfssvc_release_diropres(struct svc_rqst *rqstp) 674 { 675 struct nfsd_diropres *resp = rqstp->rq_resp; 676 677 fh_put(&resp->fh); 678 } 679 680 void nfssvc_release_readres(struct svc_rqst *rqstp) 681 { 682 struct nfsd_readres *resp = rqstp->rq_resp; 683 684 fh_put(&resp->fh); 685 } 686